you could say:
"With respect to your sentiments, I will have to request that you respect our relationship and present yourself accordingly. Whether or not you pose a threat is not the issue; the issue is the fact that you would invade our personal space and relationship like that. If you love Kathy the way you say you do, you should respect her in the very least. Can you sincerely admit that you would be okay with another man 'showering' compliments in an uninhibited manner as yourself to your girlfriend? While I respect your verbose reply, I am going to have to ask that you respect our relationship and boundaries that come along with it."


or you could just say "No matter how much color you add to your replies, your stripes will always show. F- off." =D

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Blah blah blah; not like you'll do anything anyhow~